Preschool children spend _____ in physical activity, about _____ per week:

Clouding of the crystalline lens of the eye is known as

A. vascular sclerosis B. senile macular degeneration C. senile miosis D. cataracts E. presbyopia

Each of the following is true of barbiturates EXCEPT ______

a. when taken during pregnancy, they can produce birth defects b. they can cause loss of inhibition and increases in aggression c. they can cause permanent psychosis when used by adolescents d. when prescribed as medication, they cause dependence when used for long periods